Fix QuotaFileUtil to write .usage into the same directory as "chrome-", not under "chrome-*".

webkit/fileapi/quota_file_util.cc

Index: webkit/fileapi/quota_file_util.cc
diff --git a/webkit/fileapi/quota_file_util.cc b/webkit/fileapi/quota_file_util.cc
index 820b6a8d5b3f308f97de8ef0f4f18943cb0c0c9c..626aecfdcd55883c42277b9476c6aa1aed8d6941 100644
--- a/webkit/fileapi/quota_file_util.cc
+++ b/webkit/fileapi/quota_file_util.cc
@@ -10,6 +10,7 @@
 #include "webkit/fileapi/file_system_operation_context.h"
 #include "webkit/fileapi/file_system_path_manager.h"
 #include "webkit/fileapi/file_system_usage_cache.h"
+#include "webkit/fileapi/sandbox_mount_point_provider.h"
 
 namespace fileapi {
 
@@ -43,8 +44,8 @@ static bool CanCopy(
 
 static FilePath InitUsageFile(FileSystemOperationContext* fs_context) {
   FilePath base_path = fs_context->file_system_context()->path_manager()->
-      ValidateFileSystemRootAndGetPathOnFileThread(fs_context->src_origin_url(),
-          fs_context->src_type(), FilePath(), false);
+      sandbox_provider()->GetBaseDirectoryForOriginAndType(
+          fs_context->src_origin_url(), fs_context->src_type());
   FilePath usage_file_path =
       base_path.AppendASCII(FileSystemUsageCache::kUsageFileName);